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Which of the following compounds has primary,secondary,and tertiary hydrogen atoms?


A) Pentane
B) Hexane
C) 2-Methylpentane
D) 2,2-Dimethylpentane

E) All of the above
F) C) and D)

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Which of the following statements about the conformations of acyclic alkanes is true?


A) Conformations are the same arrangements of atoms that cannot be interconverted by rotation about single bonds.
B) In the eclipsed conformation,the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon.
C) In the staggered conformation,the C-H bonds on one carbon are directly aligned with the C-H bonds on the adjacent carbon.
D) Rotating the atoms on one carbon by 60° converts an eclipsed conformation into a staggered conformation,and vice versa.

E) A) and B)
F) C) and D)

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How many constitutional isomers are there with the molecular formula C5H12?


A) 2
B) 3
C) 4
D) 5

E) None of the above
F) All of the above

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Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?   A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and D)
F) A) and C)

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